How Do You Say I’ll Let You Know in Spanish? | Say It Right

In Spanish, “te aviso” and “ya te diré” are common ways to say you’ll share an answer later, with tone and formality changing the best pick.

You’ve got a simple idea in English: “I’ll let you know.” In Spanish, you can say that idea a few different ways, and each one carries a slightly different feel. Some sound warm and casual. Some sound polite and businesslike. Some sound like you’re still thinking. Some sound like you’re promising to message the moment you find out.

This article gives you ready-to-use Spanish lines that match real conversations. You’ll see what to say, when to say it, and what small tweaks change the tone. You’ll also get short mini-scripts you can copy into texts, emails, or face-to-face chats.

Why There Isn’t One Perfect Translation

English uses “I’ll let you know” for a lot of situations: you’re waiting for a schedule, checking a price, deciding on plans, or asking a boss for approval. Spanish splits that idea into different verbs and structures. The choice depends on two things: what you’re waiting on, and how direct you want to sound.

Spanish also asks you to choose how you address the other person. If you’re using tú, you’ll say te. If you’re using usted, you’ll say le. That one switch changes the whole line, even when the meaning stays the same.

Two building blocks that show up a lot

• Avisar = to notify, to give someone a heads-up. It’s great for “I’ll message you when I know.” You can see how avisar is used in standard Spanish in the RAE dictionary entry for “avisar”. :contentReference[oaicite:0]{index=0}
• Decir = to say/tell. It’s clean and broad. If you want the base meaning “I’ll tell you,” it’s a safe verb. The RAE dictionary entry for “decir” is a solid reference point for its core senses. :contentReference[oaicite:1]{index=1}

A fast rule that keeps you from sounding off

If you mean “I’ll message you once I find out,” go with avisar. If you mean “I’ll tell you my decision,” go with decir. If you mean “I’ll tell you later,” you can use time words like luego or más tarde.

How Do You Say I’ll Let You Know in Spanish? Picks That Sound Natural

Here are the most useful options, starting with the ones you’ll hear all the time in everyday speech.

Te aviso

Meaning: “I’ll let you know / I’ll tell you (when I know).”

This is a go-to phrase for plans, updates, and confirmations. It implies you’ll reach out after you get the info. In text messages, it’s as normal as it gets.

• Text tone: “Te aviso cuando sepa.” (I’ll let you know when I find out.)
• In person: “Vale, te aviso.” (Okay, I’ll let you know.)

Te digo

Meaning: “I’ll tell you.”

This can sound a bit more direct than te aviso. It fits when you’re going to decide, then tell them. If you add a time marker, it becomes closer to “I’ll let you know later.”

• “Te digo mañana.” (I’ll tell you tomorrow.)
• “Luego te digo.” (I’ll tell you later.)

Ya te diré

Meaning: “I’ll tell you (later).”

This one is handy when you truly don’t know yet and you’re not ready to commit to a time. It can sound casual. In some contexts, it can feel like “I’ll get back to you at some point,” so use it with people who won’t take it as brush-off.

Te confirmo

Meaning: “I’ll confirm (it) to you.”

Great for reservations, meeting times, or anything where “confirm” fits in English. It feels a touch more organized than te aviso and works well in semi-formal messages.

Ahora te digo / En un rato te digo

Meaning: “I’ll tell you in a bit.”

These are perfect when the wait is short. If you say ahora, people expect it soon. If you say en un rato, it signals “not instantly, but not hours.”

Before we get into the longer mini-scripts, here’s a table you can use like a menu. Pick the line that matches your situation and the vibe you want.

Spanish phrase	When it fits	What it signals
Te aviso	Waiting for info, plans, updates	You’ll reach out once you know
Te aviso cuando sepa	You don’t know yet	You’ll message after you find out
Te digo luego	You’ll decide later	You’ll tell them later, no exact time
Ya te diré	Casual, open-ended timing	You’ll circle back later
Te confirmo	Reservations, schedules, meeting details	Clear, organized follow-up
En cuanto lo sepa, te digo	Waiting on a result	You’ll tell them the moment you know
Te escribo cuando tenga una respuesta	Text-first situations	You’ll send a message once you have it
Te lo hago saber	More formal talk or writing	Polite, slightly formal wording
Quedo en avisarte	Formal note or message	Professional follow-up tone

Choosing Tú Vs. Usted Without Stress

A lot of “I’ll let you know” lines hinge on one small choice: te (tú) or le (usted). If you use the wrong one, you can sound too familiar or too stiff for the moment.

The RAE explains how Spanish uses different forms of address depending on the relationship and setting, including tú and usted. A clear overview is in “Las formas de tratamiento” (RAE, El buen uso del español). :contentReference[oaicite:2]{index=2}

Simple swaps you can memorize

• Tú form: Te aviso. / Te digo. / Te confirmo.
• Usted form: Le aviso. / Le digo. / Le confirmo.

If you need a quick reference for usted usage and even the recommended abbreviation, the RAE’s DPD entry for “usted” lays it out. :contentReference[oaicite:3]{index=3}

How to sound polite without sounding stiff

With usted, many learners overdo it and end up sounding like a letter from a bank. You don’t need fancy phrasing. These are clean and normal:

• “Le aviso en cuanto lo sepa.”
• “Le confirmo hoy por la tarde.”
• “Le escribo cuando tenga la respuesta.”

Mini Scripts You Can Copy For Real Situations

Single phrases are useful. Full lines are what you’ll actually send. Here are ready-made options that keep the tone friendly and clear.

When you’re waiting on someone else

• “En cuanto me contesten, te aviso.”
• “Estoy esperando respuesta. Te aviso apenas sepa algo.”
• “Le aviso en cuanto tenga confirmación.”

When you’re deciding

• “Lo pienso y te digo.”
• “Déjame ver y te digo luego.”
• “Lo reviso y le digo hoy.”

When you want to set a time expectation

If you can give a time, do it. It lowers back-and-forth and makes you sound reliable.

• “Te confirmo antes de las 5.”
• “Te aviso esta noche.”
• “Le aviso mañana por la mañana.”

When you want to soften the message

Sometimes “I’ll let you know” can feel abrupt in any language. You can soften it with a short lead-in.

• “Dame un momento y te digo.”
• “Si me das un rato, te aviso.”
• “Permítame confirmarlo y le aviso.”

Small Grammar Notes That Keep Your Spanish Clean

You don’t need to be a grammar nerd to sound good. You just need two common patterns.

Avisar can take two common structures

You’ll see both of these in good Spanish:

• “Te aviso cuando sepa.”
• “Te aviso en cuanto lo sepa.”

If you want the formal reference on how avisar can be built with different complements, the RAE’s DPD entry for “avisar” explains the constructions. :contentReference[oaicite:4]{index=4}

Te aviso vs. Te avisaré

Both mean “I’ll let you know.” Te aviso uses the present tense with a near-future feel, which Spanish uses a lot in everyday talk. Te avisaré is more explicitly future. Pick based on tone:

• Casual: “Te aviso.”
• More deliberate: “Te avisaré.”

Now let’s make this even easier with a second table. Use it as a quick selector when you’re about to speak or type.

Situation	Best Spanish line	Tú / Usted swap
Friend asks about weekend plans	“Te aviso.”	Te aviso / Le aviso
You’re waiting for a reply	“En cuanto sepa algo, te aviso.”	Te aviso / Le aviso
Work meeting time isn’t final	“Le confirmo en cuanto esté listo.”	Te confirmo / Le confirmo
You need a short moment to check	“Dame un momento y te digo.”	Te digo / Le digo
You want to sound organized	“Te confirmo antes de las 5.”	Te confirmo / Le confirmo
You don’t want to promise a time	“Ya te diré.”	Ya te diré / Ya le diré
You plan to message, not call	“Te escribo cuando tenga respuesta.”	Te escribo / Le escribo

Common Mistakes That Make “I’ll Let You Know” Sound Weird

Most problems come from translating word-for-word. These quick fixes keep you sounding like a real speaker.

Mixing tú and usted in the same sentence

Pick one and stay with it. Don’t mix te with usted forms. If you’re speaking politely, stick to le and usted verbs.

Overloading the sentence

English speakers often add extra padding like “as soon as I possibly can.” Spanish can do that too, but it often sounds cleaner when you keep it short:

• Cleaner: “En cuanto lo sepa, te aviso.”
• Cleaner: “Te confirmo hoy.”

Using a phrase that feels too open-ended in a work context

Ya te diré can be fine with friends. In work messages, le aviso or le confirmo usually lands better. It signals follow-up without sounding vague.

A Ready-To-Use Checklist For Your Next Message

Before you hit send, run through these quick choices:

• Do you mean “I’ll message you once I know”? Use te aviso / le aviso.
• Do you mean “I’ll confirm details”? Use te confirmo / le confirmo.
• Do you mean “I’ll tell you my decision”? Use te digo / le digo, add a time if you can.
• Do you need polite tone without extra fluff? “Le aviso en cuanto lo sepa.”

Three plug-and-play texts

Casual: “Dale, te aviso cuando sepa.”

Neutral: “Te confirmo hoy por la tarde.”

Polite: “Le aviso en cuanto tenga confirmación.”